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author | Jeremy Fitzhardinge <jeremy@xensource.com> | 2007-07-17 21:37:05 -0400 |
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committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-07-18 11:47:42 -0400 |
commit | e46cdb66c8fc1c8d61cfae0f219ff47ac4b9d531 (patch) | |
tree | 7d9cdfef91e69fcfcba762a5a70cd58900308a5b /arch/i386/xen/time.c | |
parent | 3b827c1b3aadf3adb4c602d19863f2d24e7cbc18 (diff) |
xen: event channels
Xen implements interrupts in terms of event channels. Each guest
domain gets 1024 event channels which can be used for a variety of
purposes, such as Xen timer events, inter-domain events,
inter-processor events (IPI) or for real hardware IRQs.
Within the kernel, we map the event channels to IRQs, and implement
the whole interrupt handling using a Xen irq_chip.
Rather than setting NR_IRQ to 1024 under PARAVIRT in order to
accomodate Xen, we create a dynamic mapping between event channels and
IRQs. Ideally, Linux will eventually move towards dynamically
allocating per-irq structures, and we can use a 1:1 mapping between
event channels and irqs.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'arch/i386/xen/time.c')
0 files changed, 0 insertions, 0 deletions